Remote control mechanism for radio receiving sets



July 5, 1938. J K CA REMOTE CONTROL MECHANISM FOR RADIO RECEIVING SETS Filed Oct. 14, 1929 12 Sheets-Sheet 1 July 5, 1938.. J. F. KOCA 2,122,613

REMOTE CONTROL MECHANISM FOR-RADIO RECEIVING SETS Filed Oct. 14, 1929 12 sheets-sheet 2 y 5, 1933- 1. F. KOCA 2,122,613

REMOTE CONTROL MECHANISM FOR RADIO RECEIVING SETS Filed Oct. 14, 1929 12 Sheets-Sheet 3' Egg J. F. KOCA July 5, 1938.

REMOTE CONTROL MECHANISM FOR RADIO RECEIVING SETS Filed Oct. 14, 1929 12 Sheets-Sheet 4 July 5, 1938. J. F. KOCA 2,122,613

REMOTE CONTROL MECHANISM FOR RADIO RECEIVING SETS Filed 001;. 14, 1929 12 Sheets-Sheet 5 July 5, 1938.

J. F. KOCA REMOTE CONTROL MECHANISM FOR RADIO RECEIVING SETS Filed Oct. 14, 1929 12 Sheetgfiheet 6 July 5, 1938. KOCA 2,122,613

REMOTE CONTROL MECHANISM FOR RADIO RECEIVING SETS Filed Oct. 14, 1929 12 Sheets-Sheet 7 July 5, 1938. I J. FIHROCIA 2,122,613

REMOTE CONTROL MECHANISM FOR RADIO RECEIVING SETS Filed Oct. 14, 1929 12 ShetS-Sheet 8 July 5, 1938. J FVKOCA 2,122,613

REMOTE CONTROL MECHANISM FOR-RADIO RECEIVING SETS Filed Oct. 14, 1929 12 Sheets-Sheei 9' July 5, 1938. J, F, KOCA 2,122,s13'

REMOTE CONTROL MECHANISM FOR RADIO RECEIVING SETS Filed Oct. 14, 1929 l2 Sheets-Sheet 10 1 July 5, 1938. J. F. KOCA 2,122,613

REMOTE CONN ROI. MECHANISM FOR RADIO RECEIVING SETS Filed Oct. 14, 1929 12 Sheets-Sheet 11 llll Q/naarzfv: N

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J. F. KOCA July 5, 1938.

REMOTE CONTROL MECHANISM FOR RADIO RECEIVING SETS 12 Sheets-Sheet 12 Filed 001;. 14, 1929 N N A N w Patented July 5, 1938 Q I UNITED STATES PATENT OFFICE REMOTE CONTROL MECHANISM FOR RADIO RECEIVING SETS James F. Koca, Woodstock, IlL, assignor to Richard W. Sears, II, Chicago, Ill.

Application October 14, 1929, Serial No. 399,465

15 Claims. (Cl. 250-20) My invention relates to remote control mechaswitches and the mechanism for operating the nism for radio receiving sets, and one of its obsaine on the rear side of the dial transmitter; Jects is the provision of an improved and emcient Fig. 8 is a rear view of a portion of the interior a system for selectively tuning in any one of. a mechanism of the dial transmitter; plurality of broadcasting stations. Fig. 9 is a wiring diagram of the electrical 5 Another object of the invention is the provision mechanism, circuits and connections for the dial of improved and efllcient mechanism for controltransmitter and the selective tuning-in appaling from any one of a plurality of points distant ratus;

from a receiving set of radio apparatus the tun- Fig. 10 is a wiring diagram for the switch 10 ing in of any one of a plurality of broadcasting shown in Fig. 6 to connect the radio receiving set 10 stations. to the-source of electric power therefor;

A further object of the invention is the provi- Fig. 11 is an elevational view of the mechanism sion of electro-magnetic selective operating for controlling the volume of the signals received mechanism ofadjustable tuning apparatus for a by means of the switch at the lower right-hand radio receiving set. portion of Fig. 5; 15

Another object of the invention is the provision Fig. 12 is a side elevational view of the operof a plurality of remote control devices for selecating mechanism shown in elevation in Fig. 11; tively tuning in a radio receiving set with a Fig. 13 is a plan view of a modified form of "speaker associated with each remote control transmitter;

device. Fig. 14 is a sectional plan view of the interior 20 A further object of the invention is the provistructure of Fig. 13 connected to the electro-magsion of electrical interlocking switch mechanism nets controlled thereby in a wiring diagram, this for selective tuning mechanism of a radio receivsectional plan view being taken on the line M-ll ing set to compel a predetermined sequence in of Fig. 16 looking in the direction of the arrows;

:5 the operation thereof. Fig. 15 is a sectional elevational view of the Another object of the invention is the provikey mechanism for the transmitter of Figs. 13 sion of remote control mechanism of a selectively and 14 to show the interlocking mechanism which tuned radio receiving set to vary the volume of prevents more than one key from being operated the received nals. ata time, this sectional view being taken on the Another object of the invention is the provision line l6-l6 of Fig. 16 looking in the direction of 30 of improved and efllcient transmitting mechathe arrows; nism for a remotely controlled selective system of Fig. 16 is a sectional elevational view taken on a station radio receiving set. the line l6'i6 of Fig. 13 looking in the direction Other objects of the invention will appear hereof the arrows; and

inaiter, the novel features and combinations Fig. 17 is a wiring diagram illustrating the 35 being set forth in the appended claims. operation of the transmitter shown in Figs. 13

In the accompanying drawingsto 16, inclusive, when connected to a volume con- Fig. 1 is a sectional elevation of my improved trolling device shown in Figs. 11 and 12 and to mechanism adapted to be connected to the operthe selective tuning mechanism shown in Figs.

40 ating shaft of tuning elements of a radio station 1 to 4, inclusive. 40 receiving set; By referring to Figs. 1 to i, inclusive, it will be Fig. 2 is a sectional plan view taken on the line seen that the selective tuning mechanism is 2-2 of Fig. 1; a mounted in the casing i8 and is provided with a Fig. 3 is a sectional plan view of the structur shaft II which may be connected by means of a 4 shown in Fig. 1, with the top of the casing recoupler 2| to the shaft 2| of a radio receiving set, 6 moved; this shaft 2| being the actuator for the tuning Fig. dis a front elevational view of our imelements of the radio receiving set. proved selective tuning-in mechanism adapted to Projecting through the slots 22 in the front be connected to the tuning shaft ofthe radio face of the casing I8 is a plurality of actuating receiving set; lever devices as shown in Figs. 1 and 4. each pro- 50 Fig. 51s an elevational view of the control dial vided with a push-button 23 in the form of a of the remote control transmitter; screw-threaded cap knurled on its cylindrical Fig.6 is a sectional side elevational view-of the surface. There-are as many of these push-butdial control transmitter shown in H8. 5; tons 22 as broadcasting stations which are to be 56 Fig.7isarearview showingtheelectric tunedinforthereceivingset. rorihstanceinls Figs. 2 to 4, inclusive, each push-button represents a separate broadcasting station and the apparatus may therefore be set for tuning in nine separate broadcasting stations.

As shown in Fig. 1, the lever 24 is pivoted at 24. An auxiliary lever 26 is pivoted at 21 to the lever 24. Projecting downwardly from the lever 24 is a bracket arm 24 to the lower end of which is pivoted at 24 a segment 30 which has an upper arcuate surface to receive the brake-shoe 3| which is pivoted at 42 to the lever 24. A heel 33 on the lever 24 near the pivot 21 is adapted to engage the upper left-hand end of the brake-shoe 3|. When thescrew-cap 24 is threaded on the clamp 34 as shown in Fig. i, the two levers 24 and 24 are drawn together with the result that the heel 33 applies the brake-shoe 3i to the upper arcuate surface of the segment 34 and holds the latter in adjusted position. The clamp 34 has a recess in its lower end to receive the detent 34 at the outer end of the lever 24. The finger 36 at the outer end of the lever 24 fits in the clamp 34 and pro- .iects upwardly into the screw-cap 23. Therefore when the cap-screw 23 is screwed down over the clamp 34 the detent 34 and the finger 36 are drawn toward each other to cause the heel 33 to apply the brake-shoe Ii to the segment 30 to hold the latter in fixed position on the pivot 23 relative to the lever 24.

On the ends of the shaft I! are pinions 31. In mesh with the opposite sides of each pinion 31 is a pair of vertical rack bars 34, 39 suitably guided at 44, 4| to move along vertical lines. The lower ends of the rack bars 44 and 44 are provided with transverse horizontal cross plates 42 and 43 in position to be engaged by the toes 44 and 44 of the segment 34. As shown in Figs. 1 and 2, the rack bars may be connected at their upper ends by cross plates 42', 44' to form rectangular or square rack frames.

When 'a desired station is tuned in at the radio receiving set by means of the usual dials thereon, the tuning shaft 2i will transmit movement to the pinions 31. Two of the pairs of rack bars will be moved up and the other two will be moved down. In Fig. 1 it has been assumed that for a certain predetermined broadcasting station the pinion 31 will move the rack bars 34 and 39 so that the plates 42 and 43 will be in the same horilontal plane. Now by holding the radio receiving set tuning shaft 2| in the desired position to cause the radio receiving set to receive signals from a predetermined broadcasting station, the rack bars 44 and 34 will be held stationary. By loosening the cap 24 the brake-shoe 4| will be released and the segment 44 will be free to turn on the pivot 24. Upon depressing the push-button 23 together with the levers connected thereto to the dotted line position shown at u in Fig. 1, the toes 44 and 44 willengage the plates 42 and 44 and move the segment 44 on the pivot 24 to the position shown in dotted lines. Then upon tightening the cap 24 the brake-shoe U will be applied to thesegment34whilethetoes44and44stillenlite the plates 42 and 44. The screw-cap 23 is then retained in its chmping position was to positionahownatllinl'lg.l,thetoes44and4i 'willengagethephtes "and" and brinathem llenaasinatbeptatesuandon pinion 31 so as to re-locate the shaft 2! in its exact predetermined position.

It should be understood that for each set of levers there is a separate segment 30 with a brakesh'oe 3i applied thereto. The levers 24 and 24' are shown of different shape in Fig. l merely to provide more space for the push-buttons 23. Associated with the levers 24 and 26 is a separate arcuate segment together with a separate brakeshoe and there are the same pinions fixed to the shaft i4-and in mesh with two pairs of rack bars. In most instances after a station has been tuned in one of the plates 42 and 42 will be above the other. While held in such positions by holding the shaft 2i stationary at the radio receiving set, the toes 44 and 45 may be brought into contact with the plates 42 and 43 and then locked in position. Subsequent downward pressure on the push-button 23 will then move the rack bars into positions where one of the plates 42, 43 will be in the same relative positions as before, one at a higher elevation than the other.

When the various double lever devices have been operated to lock their respective segments in adjusted positions the spring 41 will act on the arm 44 connected to the lever 24 and move the levers 24 and 24 to their uppermost positions where they will be stopped by the abutment 49.

Pivoted to the bearing shaft is a lever 44 which is provided with a slot 4i into which prolects a pin 42 from the lever 24. A spring 43 is connected between an arm 44 on the lever 44 and the lever 24. The spring 53 therefore tends to move the lever 50 in an anti-clockwise direction,

but this movement is limited by the right-hand end of the slot Si in the lever 44 impinging against the pin 52 projecting from the lever 24. It should be understood that one lever Bil is provided for each of the levers 24. In other words, the number of the levers 44 equals the number of the levers 24.

To the upper end of the lever 44 is pivoted at '55 a latch pawl 44. A spring I"! connected between the bracket arm 44 on the lever 44 and the right-hand portion of the latch pawl 44 draws the latter downwardly against the stop 54 on the lever 44. The left-hand end of the latch pawl 44 is provided with a magnetic armature 44 which is associated with the upper end of the electromagnet 4i. When the latter is energized the armature 44 is drawn downwardly and the latch pawl 44 is moved into its dotted line position 42 where it will engage the front side of the catch 43 as shown in Fig. 1.

Fig. 3 shows in plan view the various armatures 44 on the latch pawls 44 which are pivoted at the upper ends of the levers 44. The catch 44 is formed by bending down the right-hand edge of the plate 44 as viewed in plan in Fig. 3. The catch 43 is therefore common to all of the nine separate latch pawls 44 shown in Pig. 3 in plan view.

The plate 44 is provided with horizontal spaced-apart rack bars 44, 44 as shown in 16g. 3 and these rack bars mesh with pinions 41 and 44. the ends II and II of which are journaled inbearingsinthesidesofthecasing II. On axes which arein vertical alineinent with the axisof the shaft 44arerollers l2 forthebottom sidesoftheplateflbeneaththerackbara'll and".

Oonnectedatliandfltotheplateflare plungers l4 and I4 of iron which project into thesolenoidsllandl4respectively.asshown inI'lg.'3. Theaesolenoidsareeonnectedin series and when they are energized, the plungers l and 16 will be pulled toward the left, as

viewed in Fig. 3. This movement of the plungers i5 and It will draw the plate it together with the catch 63 thereon toward the left. It is desirable that the plungers I! and It should be moved equally and in parallelism so that the catch 63 will retain a position at right angles to its path of travel. The rack and pinion mechanism 65, 61 and 88, 68 assure such parallel movement. The racks 65 and 66 are held in mesh with the pinions l1 and 88 by the guide rollers 12 mounted as shown in Fig. 1 so as to engage the under sides and lateral edges of the plate 64 beneath the racks I5 and 66.

When one of the selector electro-magnets I is energized, it attracts its armature Gil so as to move the latch 58 into its left hand dotted line position, as viewed in Fig. 1. Then, when the solenoids I1 and II are energized, the catch it will move the latch 56 to its right hand dotted line position. Consequently, the lever 50 will be moved to its right hand dotted line position and when this occurs, the arm 54 will exert a pull through the spring 53 on the adjusted lever mechanism 24. 26 so as to move the locked segment 30 to its lower-most position. In Fig. 1, the segment 30 is shown so locked in position that when the lever mechanismis moved to its dotted ions 31 and the shaft is to rotate to a predetermined position in order to tune in a certain predetermined broadcasting station.

It should be particularly noted that the pull between the lever 50 and the tuning mechanism is through a spring I3. This is for the purpose of enabling a very accurate movement of the shaft. is to be made without any interference from the elec'tro-magnetic mechanism comprising the solenoids TI and 18. The shaft is is accurately set to tune in a predetermined broadcasting station and if the electro-magnetic mechanism comprising the solenoids I1 and II pulls the lever 50 slightly beyond the desired position for the tuning in mechanism, the slot Il may ride over the pin 52 on the lever 24. It

will thus be seen that by reason of the pin and slot connection at SI, 52 between the levers ill and 24, lost motion between these levers is provided so that accuracy of the setting of the .shaft is need not depend upon the accurate stopping of the plungers I! and It. It is preferred to have the plungers l5 and 1 stop beyond the limit of the movement of the lever 24 so that the slot 5| will ride over the pin 62 thereby enabling the spring 58 to yieldingly hold the toes 4| and 45 in en agement with the plates 42 and I! and thus very accurately, in every instance, set the shaft at its predetermined position to tune in a certain predetermined broadcasting station.

In order that the plungers II and I8 will not be drawn or pulled into the solenoids I1 and II too suddenly or quickly when these solenoids are energized. a dash-pot II is secured at one integral with the plate 64. Therefore, when the solenoids I! and 18 are energized and the plate 64 is pulled toward the right, as viewed in Fig. 1, or toward the left, as viewed in Fig. 3, the dash-pot will resist such movement by acting as a brake. When the solenoids I1 and 18 are deenergized, the spring 89 on the piston rod 8i will act to restore the plungers l5 and 16 to their initial positions, and also the catch 63 to its initial position, as shown in full lines in Figs. 1 and 3. It should also be understood that when the solenoids l1 and 18 are de-energized, the spring 41. by acting on the arm 48, will restore the lever 50 to its initial position shown in full lines in Fig. 1. The spring 51 will restore the latch 58 to its initial position shown in full lines in Fig. 1. The slot H at its right hand end, as viewed in Fig. 1, will engage the pin 52 on the lever II and positively move the levers 24 and 26 back to their initial positions shown in full lines in Fig. 1, where the lever 28 will abut against the limit stop l9.

' It should be particularly noted that when the solenoids l1 and II are de-energized and the parts shown in Fig. 1 are restored to their initial positions, as shown in full lines, the setting -of the shaft is is not disturbed. That is to say, when the segment a is moved from its dotted line position shown in Fig. l to its full line position, the racks 88 and 39 are left exactly where they have been set and consequently the shaft II is left in its accurately set position. After a broadcasting station has been tuned in, the

solenoids TI and It may bade-energized with the assurance that the receiving set will remain with its tuning shaft in its set position.

Telephone receivers or loud speakers connected to. the receiving set, may therefore be cut out during the tuning in of the radio receiving set so that no signals will be received-until desired from the particular broadcasting station whichv is to be tuned in. For this purpose, an electric switch is provided at ll. An actuator 9| is mounted on the upright plate 82 as shown in Fig. 1, in position to engage the spring arm 82 of the switch" to hold the latter closed while the spring 89 holds the plungers I5 and It in their extreme left-hand positions, as viewed in Fig. 1. When the solenoids l1 .and I. are energized and the plungers II and II are pulled toward the right as viewed in Fig. 1, the actuator Ii will become disengaged from the spring arm 92, thereby permitting the switch OI to open and thus open the circuit of the telephone receivers and loud speakers, either or both, which are connected to the terminals 83 and M. It will thus be seen that during the period of rotation of the shaft is to tune in a. certain predetermined broadcasting station, the switch 30 will be opened so that although the receiving set is connected for reception of signals. no signals will be heard from the loudspeakers .or telephone receivers until-the switch ll is again closed. As above explained, when the solenoids l1 and It are de-energized, the parts will be restored to their full line positions shown in Fig. 1, and when this occurs, the switch ll will be closed to-restore theconnection to the loud speakers and telephone receivers.

Asshowninthewiringdiagraminl'ig.9, there areas many of the electro-magnets Ii as there are'broadcasting stations which are to be tuned inby'means'of'remote control mechanism.

1 A transmitter is therefore provided to select one of the ei'ectro-magnets 6| corresponding to the desired broadcasting station. A dial transmitter such as that shown in Figs. 5, 6, 8 and 9 may be used to select the desired electro-magnet BI. The dial transmitter of an automatic telephone set may be modified to adapt the same to our system of control.

Secured to the casing 05 is an auxiliary casing 06 to which is secured a ring 91 having thereon in fixed positions the designations oi the various broadcasting stations, as shown in Fig. 5. In rront of the fixed ring 01 is a rotatable ring having openings 90 therein to receive one of the operator's fingers so that he may rotate the ring 90 until his finger engages the fixed stop I00, the latter being secured to the auxiliary casing 90, as shown in Fig. 6. For instance, if the broadcasting station designated "KYW" is desired, the opening 00 at KYW will be engaged and the ring 80 moved through an angle of nearly 45. Whereas, if the station WLS" is to be tuned in, the ring 80 will be rotated through an angle of approximately 315.

The rotation of the ring 00 in a clockwise direction, as viewed in Fig. 5, effects a clockwise rotation of the plate IOI, shown in Fig. 8, and so also of the shaft I02 which is connected there- 1 to. Such rotation of the shaft I02 effects a winding of the spring I02, one end of which is secured to the shaft I02 and the other end of which is connected to the back of the casing 06, as shown in Fig. 7. When the plate Ill is moved in a clockwise direction, as viewed in Fig. 8. the pawl I04 thereon will ride freely over the ratchet teeth I05 as permitted by the spring I08, one end of which is connected to an arm I0I which is pivoted at I00 to the arm Ill. The other end of the spring I06 is connected at IIO to the finger III which projects from the plate IOI. As before stated, clockwise rotation of the sha I02, as viewed in Fig. 8, will wind up the spring I02 and therefore when'the operator's finger is released from the ring 00, the latter will be rotated anti-clockwise by the spring I03 until the finger III abuts against the limit stop II2, shown inFig. 8 as beingintegrai with the plate II3 to which the finger stop III is secured. When the wound up spring I03 thus rotates the ring 00, the shaft I02 and the plate III will also be rotated anti-clockwise. This will cause the pawl.

I04 to engage the ratchet I" to rotate the latter in an anti-clockwise direction and so also the gear wheel II4 which is secured thereto.

The gear wheel II4 meshes with a pinion III which is mounted on the shaft IIO. The latter projects through the back oi the casing 08 and has mounted thereon a worm gear III which meshes with a worm III on the shaft Ill. when the shaft II! is rotated by the unwinding of the spring I03, the governor I acts to retard the rapid rotation oithe shaft III. This governor comprises a cup III which is secured to the back of thecasing 00 and hasan annular cylindrical surface adapted to be engaged by the brake shoes I22 onthe spring arms' I23 which are attached to the shaft III and rotate therewith.

Secured to the shaft I02 so as to rotate there- -with are switch actuating devices m and m.

When the dial transmitter is in its initial position-where the finger III abuts against the limit stop II2, the actuator I24 engages the button I20 of insulating material to hold the switch I21 closed. as shown in Fig. 7. At the same time, when the transmitter is' in its initial position, the switch actuator I2, by mm the insulation I button I20, holds the switch I29 in open position, as shown in Fig. 7. When the operator, by engaging a station-designated opening 99 in the ring 98, rotates the latter in a clockwise direction, as viewed in Fig. 5, the shaft I02 will be rotated in an anti-clockwise direction as viewed in Fig. 7. Therefore, as soon as the operator moves the ring 08, the switch actuators I24 and I25 shown in Fig. 7 will release the insulation buttons I26 and I20. The actuator I25 is longer circumferentially than the actuator I24 and therefore the button I28 will be released to effect the opening of the switch I2'I before the actuator I25 releases the button I20 to permit the switch I28 to close. When the operator's finger engages the stop I00 and the ring 90 is about to be released, the switch I21 will be open and the switch I29 will also be open. The purpose of the actuator I25 engaging the button I28 is to hold the switch I20 in open position so that it cannot be closed.

by the switch actuator I30 on the shaft I I0 except after the ring 90 has been released by the release of the operator's finger from the stop I00. Furthermore, the actuator I25 by engaging the button I20, when the shaft I02 is restored to its initial position, will hold the switch I29 open so that it will not be affected by the last half rotation of the shaft IIS and the actuator I30 thereon. v

After the operator has moved the ring 90 as far as the stop I00 will permit and this ring is released, the spring I03 will effect rotation oi the gearing above described so as to rotate the double-armed insulated actuator I30. The spring arm III of the switch I23 will be actuated twice during each rotation of the shaft IIG so as to eflect the closing of the switch I20 and the opening thereof twice during each rotation of the shaft iii.

In Fig. 9, switches I21, I29 of three dial transmitters are diagrammatically illustrated. The dial transmitters may be stationed at various remote places relative to the radio receiving set. For instance, the radio receiving set, together with its batteries and the tuning in apparatus shown in Figs. 1, 2, 3 and 4, may be located in the basement of a dwelling whereas the dial transmitters such as that illustrated in Figs. 5, 6, 7 and 8 may be located in various 'rooms upstairs.

When the switch I2! is closed by rotation of the insulated actuator I30, the electro-magnet I32 of Fig. 9 will be energized by being connected directly across the terminals of the battery I33. The circuit will be through the conductor I34, switch I23 and the conductor I35, thence through the electro-magnet I22, back to the battery I30, through the conductor I36.

Each time the electro-magnet I32 is energized. the armature III will be drawn toward the right, as viewed in Fig. 9, to cause the pawl I38 to engage the ratchet teeth I30 on the segment I40 which is pivoted at I4I to the panel-board I42. The switch arm I43 will be moved in an anticlockwise direction step by step' each time the switch I2! is closed so as to move the righthand end of the switch arm I42 into engagement with various switch contacts I44 which are connected to the electro-magnets 6| individually and successively. Each time the segment I40 is stepped around, it will be held in the position to which it has been moved by the pawl I45 against the action oi the spring I40 which is connected at its upper end I41 to the panel-board I42 and at its lower end to the segment I40.

onto the desired contact I44.

It should be understood that the dial transmitter is so constructed and arranged that its gearing will effect the desired number of rotations of the actuator I30 to correspond with the desired number of electric impulses necessary in the electro-magnet I32 to step the arm I43 If the station KYW" is desired, the actuator I30 will be retated a predetermined number of times so as to close the switch I29 a suflicient number of times to cause the arm I40 to be stepped onto the first contact I44 and stop there. This will eflect a connection to the first electro-magnet 6I at the right hand end of the series shown I48. Not until the operator releases the ring 98- the arm I43; the return to the battery in Fig. 9. If the station WLS is desired, the

gear ratio is such that the actuator I30 will be rotated a suilicient number of times to cause the switch I29 to send the necessary number of electric impulses through the electro-magnet I32 to step the arm I43 onto the last contact I44 and thereby connectthe electro-magnet H which is shown at the left hand end of the series in Fig, 9

During the step by step movement of the arm I43 in an anti-clockwise direction, none of the electro-magnets 6| can be energized because the circuit through them remains open at the switch and the latter returns to its initial position can the selected electro-magnet 6I be energized. This is for the reason that only when the dial transmitter is in initial position is the switch I21 closed and only when the latter switch is closed can the electro-magnet I 49"be energized to tilt the armature lever I50 to cause the left-hand end thereof to engage the insulated button I5I and close the switch I48. Then,- a current of electricity will flow from the battery I33 through the conductors I34 and I52 to and throughtheswitch I48, the selected electro-magnet 6i, the contact I44, the switch arm I43, 'and thence through the conductor I53 which is connected to I33 is through the conductor I54.

The armature lever I50 may be pivoted at I55 to a bracket I56 secured to the panel-board I42. A downwardly projecting detent arm I51 from the center of the armature lever I50 is adapted to engage a detent spring I58 so as to hold the armature I50 in the position to which it has been moved by either the electro-magnet I49 or the electro-magnet I59.

When the electro-magnet I49 becomes energized by the return of the dial transmitter to initial position and the consequent.-closure of the switch I21, the circuit'through the electromagnet I49 will depend upon the closure of the switch I60. When the switch arm I43 is in its initial position shown in Fig. 9, the insulated button I6I thereon engages the switch arm I62 which, though the insulated button I63, holds the switch I open. Therefore, the electromagnet I49 cannot be energized while the switch arm I43 is in its initial position. As soon as the dial transmitter is operated, the switch I21.

is closed. As before stated, the energization of the electro-magnet I49 will cause the armature I50 to engage the button I5I and close the switch I48. The selected electro-magnet 6| will then be energized to move the armature 60 of Fig. 1 to its dotted line position and hold the latch 56 in the latters dotted line position where it will engage the catch 83.

When the electro-magnet I49 is energized and the button I5I actuated to close the switch I48 to effect energization of the selected electro-magnet 6|, the switch I64 will next be closed. That is to say, the switches I48 and I64 close successively so that the electro-magnets 6| will be energized before the switch I64 is closed. The closure of the switch I64 will effect energization of the solenoids 11 and 18, shown in Figs. 1 and 3 and diagrammatically in Fig. 9. A circuit through the solenoids 11 and 18 will be through the conductors I34, I52, switch I64, conductor I65, through the solenoids 11 and 18 and thence back to the battery through the conductor I66. The energization of the solenoids 11 and 16 will cause the setting of the tuning shaft in the desired position corresponding to the selected broadcasting station, as predetermined by the' right-hand positions. The relative position of the switch I66 is shown in Fig. l, and the circuit therefor is shown in Fig. 9.

When the switch I68 is closed, a circuit is established from the battery I33 through the conductors I34, I69, the electro-magnet I58, the conductor I10, switch I68, and conductors I1l, I66, back to the battery I33. The armature lever I50 being held by the detent mechanism I51, I58 is holding the switches I46 and I64 closed but after ,the solenoids 11 and 18 have been energized and the switch I68 is closed, the electro-magnet I58 will be energized to draw the armature lever I50 into its full line position shown in Fig. 9. The armature lever I50 will then engage the insulated button I12 to effect closure of the switch "3., At this time, the pawl I45 is still holding the segment I40 and the switch arm I43 in their selected positions. Therefore, the spring arm I62 will be released and the switch I14 will be closed. Consequently, when the switch I13 is closed by the energization of the electro magnet I59, a circuit will be established from the battery through the electro-magnet I15 as soon as the dial transmitter returns to initial position and closes the switch I21.- A circuit will then be established from the battery through the conductor I34, switches I21 in series, conductors I18, I11, electro-magnet I15, conductor I18, switch I14, conductor I19, switch I13, conductors I80, I68 back to the battery I33. The energization of the electro-magnet I15 will act' on the armature connected to. the pawl I45 against the action of the spring I8I. The armature of, the pawl I45'may be pivoted at I 82 to a bracket I33 secured to the panel-board I42.

From the foregoing it will be seen that the interlocking protecting electrical switches assure position by the energization of the-electro-magnet I18, the circuit of the latter magnet is opened at the switch I14. The only time that the elec-- tro-magnet I18 can be energized is when the switch arm I48 is on a selected contact I44 and the electro-magnet I88 is energized. As soon as the dial transmitter is actuated by the operator, the switch I21 is opened and this switch remains open until after the electro-magnet 8| for the desired station has been selected and energized. This selection is made by the return of the dial to its initial position. Therefore, not until the arm I48 has been stepped around to its desired position is the switch I21 again closed. The circuits and connections are such as to compel the stepping around of the switch arm I42 to the desired contact I44 while the dial transmitter is returning to its initial position before the electro-magnet I48 can be energized. The switch I88 is closed while such selection of one of the electro-magnets 8| is being made but not until the switch I21 is closed can the magnet I48 be energized and therefore not until the dial transmitter returns to initial position can the selected electro-magnet 8i be energized because energization of the selected electro-magnet depends upon the closure of the switch I48 and the closure of this switch depends upon the energization of the electro-magnet I48. Furthermore, the switch I48 must first be closed before the switch I84 can be closed, and not until the latter is closed are the solenoids 11 and 18 energized. Not until the latter have operated the selector mechanism is the switch I88 closed. The closure of the switch I88 is followed by the energization of the electromagnet I88. This, in turn, is followed by the closure of the switch I18, and, finally, the electromagnet I18 is energized to release the pawl I48. The energization of the electro-magnet I18 depends upon the closure of both of the switches I13 I and I21 as well as upon the closure of the switch receiving set.

I14. As soon as the electro-magnet I58 is energized to effect closure of the switch I13, the switches I48 and I84 will be opened to effect deenergization of the .selected electro-magnet 6i and of the solenoids 11 and 18. The switch I88 will then be opened. Upon the energization of the electro-magnet I18 to release the pawl I48, the spring I48 will return the switch arm I48 to initial position whereupon the switches I14 and I88 will be opened. It will thus be seen that when the selection of the desired broadcasting station has been made, all of the parts will be restored to their full line position shown in Figs. 1 and 9 and no current will be flowing through any of the electro-magnets since all of them are disconnected from the battery I83 after the desired broadcasting station has been tuned in.

when the spring 88, shown in Fig. 1, returns the plate 82 to its initial position, the actuator 8I thereon will engage the spring 82 to close the switch 88 and thus restore connection of the telephone receivers and loud speakers to the radio One or more telephone receivers, or loud speakers, or both, may be associated with each dial transmitter at its particular location remote from the radio receiving set and the selector mechanism connected thereto. I

In order to connect the radio receiving set to the source ofelectric power, a switch I84 may be located at the transmitter. As indicated at the lower left-hand portion of 'Fig. 5, this switch may be used to turn the power on or turn it 03. In Fig. 10 is shown a plurality of switches I84 one for each of the dial transmitters and connected in parallel to each other so that the closure 0! any one 'of them will connect the battery I85 to the solenoid I88 of the relay I81. When the solenoid I86 is energized, the plunger I88 will move the switch plate I88 to connect the contacts I88 and hereby connect the battery or source of power I8I to the radio receiving set I82.

Also mounted on each of the dial transmitters, is a switch I83 for controlling the tone volume in the loud speakers or telephone receivers. As shown in Fig. 6, the switch I83 comprises a set of three contacts, the middle one I94 of which may be moved into engagement with the contact I88 for a soft tone and into engagement with the contact I88 for a loud tone. The contacts I84, I88, and I88 are connected respectively to the leads or conductors I81, I88 and I98, which extend to the radio receiving set where there is located the structure shown in Figs. 11 and 12, for operating the shai't 288 connected to a rheostat for one of the radio tubes in the receiving set. In other words, the shaft 288 may be connected to a filament rheostat so that when the current flow is decreased through the filament, a softer tone volume is effected and when the current fiow is increased through the filament, a louder tone volume is obtained in the loud speakers or telephone receivers at the dial transmitting station.

As shown in Fig. 11, the conductor I81 of Fig. 6 is connected to the negative terminal of the battery 28I, the positive terminal being connected by the conductor 282 to the spring terminals 283 and 284 mounted on the lower arm 288 of the vibrating device 288 which is secured to the shaft 288. The vibrating device 286 is provided with a pair of laterally extending arms 281 and 288 at the outer ends of which are armatures 288 and H8 located 'above the electro-magnets ,minals 283 and 284 engage screw-threaded adjustable electric contacts 2I3 and 2I4, respectively. The contacts 2I3 and 2I4 are mounted on but insulated from the back plate 2i! of the casing 2I8. The conductors I88 and I88 of Fig. 6 are connected as shown in Fig. 11, to the electromagnets 2I2 and 2| I, respectively.

Extending upwardly from the central portion of the vibrating'device 288 is a vertical arm 2I8 to which is pivoted at 2I1 a pair of pawls 2I8 and 2I8 associated respectively with the ratchet wheels 228 and HI. These ratchet wheels are mounted in spaced-apart relation in parallel planes, as shown in Fig. 12, and both are fixed to the shaft 288. The ratchet teeth extend in opposite directions on the ratchet wheels 228 and 22I, as shown in Fig.11.

The double pawl 2I8, 2I8 has an arm 222 extending upwardly from the pivot shaft 2I1 and to the upper end of this arm 222 are connected the springs 228 and, 224, the other ends of which are connected to the brackets 225 and 228 secured to the plate 218.

When the switch contact I84 of Fig. 6 is moved into engagement with the contact I88, a circuit from the battery 28I is completed through the electro-magnet 2I2 and thereupon, its armature 2I8 will be drawn downwardly to move the arm 2I8 in a clockwise direction. This movement will cause the spring 228 to move the pawl.2| 8 into engagement with the ratchet teeth of the ratchet wheel 228 and, consequently, the latter will-be moved clockwise to step the shaft 288 around in a clockwise direction. The movement of the armature 2III alsomoves the arm 288 in a clockwise direction, which causes the spring 203 to become disengaged from the contact 2I3, thereby de-energizing the electro-magnet 2I2 to release the armature M0 and thereupon the spring 204 will move the spring 203 back into engagement with the contact 2I3. If, at this time, the contact I94 still engages the contact I95, the operation by the electro-magnet 2I2 will be repeated and the shaft 200 will be stepped forward again. In other words, so long as the contact I94 is held in engagement with the contact l95, the opening and closing oi. the switch 203, 2I3 will cause a step by step movement of ;the shaft 200 in a clockwise direction. As indicated at the lower right-hand portion of Fig. 5, downward move-- ment ofthe lever of the switch I93 will effect engagement of the contacts I94 and I95 and produce a softer tone volume. Therefore, the shaft 200 of Figs. 11 and 12 should be connected to the rheostat to increase the ohmic resistance and decrease the current through the tube filament.

In the same manner, a louder tone volume may be secured by bringing into engagement the contacts I94' and I99 to effect energization of the electro-magnet 2. This will cause the switch 204, 2I4 to open and close repeatedly to secure operation of the pawl 2I9 against the teeth of the ratchet wheel 22I to rotate the shaft 200 in. an anti-clockwise direction and thus decrease the ohmic resistance in circuit with the tube filament 221 is mounted on a horizontal base plate 229,

as shown in Figs. and 16. Switch levers 229 are respectively associated with the designations 230 of the various broadcasting transmitting sta tions. As illustrated a rectangular plate 23I is provided with a rectangular opening 232 and secured to the top of the casing 221 in position to permit the label plate 233 to be slid under the raised portion of the plate 23I, as shown in Fig. 16. The beaded rear edge 234 may act as an abutment against the rear edge oi the raised portion of the plate 23I.

The switch keys or levers 229 are each mounted loosely on the bearing shaft 235, the ends of which are secured to the brackets 239, 239 secured to the plate 231, as shown in Figs. 14 and 16. Between each key'lever 229 and the next adjacent one is a spacer 239 which may be in the form of a cylindrical sleeve on the bearing shaft 235.

Each of the key levers 229 is provided with a toe 239 imposition to engage the spring arm 240' so as to move the contact 24I into engagement with, the contact 242 to electrically connect the lector mechanism shown in Fig. 1. In the same manner, operation of any of the other switch keys 229 will effect the energization of the desired selector electro-magnet 9I corresponding to the broadcasting station designated on the transmitter. In Fig. 14, the circuit for the selector electro-magnet 9| will be from the. battery 248 through the con tor 249, the selected electromagnet 9|, conil iztor 243, switch 2, 242, conductor 244, to t e other side of the battery 249.

Since the switch 245, 249 closes after the switch 24I, 242 has been closed, the circuit through the solenoids I1 and I9 will not close until after the selected electro-magnet 9I has been energized. The latch 59 of Fig. 1 will therefore be in its dotted line position when the solenoids I1 and I8 are energized. The circuit through the solenoids 11, I9 in Fig. 14 will befrom the battery 249 through the conductor 250, conductor 241, switch 245, 249, and conductor 244 to the other side of the battery 249.

As shown in Fig. 13, a switch key 25I is provided 'at the left-hand end of the transmitter for producing'soft tone volume. At the right hand end of the transmitter, a switch key 252 is provided for effecting loud tone volume. In Fig. 14, the circuits and connections are shown for effecting the energization of the solenoids 2H and 2I2. The electro-magnet 2 is controlled by the switch key 252 to control the loud tone volume and the electro-magnet 2I2 is operated by the switch key lever 25I to control the soft tone volume. The switches 203, 2I3 and 204, 2 are illustrated diagrammatically in Fig. 14.

A simplified wiring diagram is shown in Fig. 1'7 to more clearly illustrate the connections of the loud and soft switch levers to the battery 249 and the electro-magnets 2H and 2I2. When the loud switch lever 252 is operated to connect the switch contacts 253 and 254, the battery 249 will be connected through the conductor 202 and the switch 294, 2 to the electro-magnet 2H and then. through the conductor 255, switch 253, 254, and conductors 259, 244 to the other side of the battery 249. When the soft switch lever 25I is operated, the switch 259, 259 will be closed and this will close a circuit from the battery 249 through the conductor 202, switch 203,2, electro-magnet 2I2, conductor 290, switch 259, 259 and conductors 29I, 259, 244, to the other side of the battery. It will thus be seen that by closing the switch 253, 254 by means of the loud key lever, the electro-magnet 2 will be operated to move the shaft 200 of Fig. 11 step by step in an anti-clockwise direction. By operating the soft key lever 25I, the switch 259, 259 will be closed to energize the electro-magnet 2I2 which will cause the operation of the shaft 200 in a clock- "and 245, 249 for successively energizing the selector electro-magnet 9i and the solenoids TI, 18 in parallel. It should be understood that the solenoids II, 19 may be connected either in series, as shown in Fig.9, or in parallel, as shown in Figs.

. 14 and 17.

By referring to Fig. 16, it will be seen that when the switch key lever 229 is released, the resiliency of the spring arm 240 will automatically return the key lever to initial position and also open theswitches 244, 242 and 245, 249. In the same manner, when the soft and loud key levers 25l and 252 arereleased, they will be automatically returned to their initial positions and their respective switches automatically opened. When the selected broadcasting station is tuned;

iii

in at the radio receiving set, all of the electromagnets shown in Figs. 14 and 17 are de-energized.

In order to prevent any more than one of the switch levers 229, 2H and 262 from beingoperated at a time, each of these levers is provided with a forwardly extending arm 251, the lower side of which is V-shaped, as shown at 262 in Fig. 15. The arms 251 move in slots 26! in an elongated grooved bar 264 which is C-shaped in cross section as shown in Fig. 16. The front side of this grooved bar 264 is closed by a plate 265 and in the grooves are located a series of rollers 266 which entirely fill the groove between end abutments 261 and 266 mounted on brackets 269 and 210 on the plate 231, except that Just suiiicient space is permitted for a single one of the arms 251 to move in its slot 263. The bottom V-shaped sides of the arms 261 act as wedges to move the rollers to one side or the other so as to clear the space for the single arm 261'to move in its slot 263. When an operated switch lever 229, 251 or 262 is released, any other single switch lever is free to be operated to depress its arm 251, but when this has been done, all of the other switch levers are locked against operation by the rollersor discs 266.

I claim:

1. In a radio tuning selector, the combination with a tuning shaft, of a plurality of operating devices therefor corresponding to various broadcasting stations, a plurality of actuators one for each oi said devices, a plurality of selector magnets one for each of said actuators, and electromagnetic mechanism for operating a selected actuator to in turn operate the selected device to turn said shaft to a predetermined position corresponding to the broadcasting station selected.

2. In a remote controlling system for radio receiving sets, the combination with an actuator connected to the tuning elements of a radio station receiving set, of a plurality of selector magnets one for each of a plurality of broadcasting stations, a plurality of setting devices for said actuator one for each of such broadcasting stations, a common operating magnet, and connectors operated by said selector magnets for causing said operating magnet to operate the setting device corresponding to the operated selector magnet.

3. In remote control of radio receiving sets,

the combination with a tuning shaft, of a plu-' rality of devices for operating said shaft to tune in any one of a plurality of broadcasting stations, a plurality of selector magnets one for each of said devices, electro-magnetic means for operating said devices, and a plurality of connectors one i'o'r each of said devices and operable by said selector magnets to effect connection between said electro-magnetic means and said devices.

4. In a radio tuning selector, the combination withselector devices one for each broadcasting station, of operating levers one yieldingly connected to each of said selector devices, automatic means for actuating the selected lever, and a plurality of eiectro-magnetic selector devices one for each of said levers.

5. In a radio tuning selector, the combination with a tuning shaft, of a plurality of operating devices therefor corresponding to various broadcasting stations, each of said devices comprising a pivoted latch, a plurality of magnetic armatures one for each of said latches, a plurality of selector magnets one for each of said armatures, a common catch for all of said latches, and an electro-magnet for operating said catch to actuate the operating device selected by one of said selector magnets moving its latch into the path of said catch.

6. In a radio tuning selector, the combination with a plurality of tuning in devices each comprising an-operating lever, actuating levers one for each of said operating levers, a pin and slot connection between said levers, means for selecting any one of said actuating levers for operation, means for operating the selected actuating lever, and a spring for transmitting movement from the selected actuating lever to the adjacent operating lever, the pin and slot connection between the levers permitting the actuating lever to move forward somewhat after the operating lever stops.

'1. In selector mechanism for radio tuning, the combination with a plurality of devices for tuning in any one of a plurality of broadcasting stations, of electro-magnetic means for selecting one of said devices to be operated, electro-magnetic operating means having a normal inoperative position for operating the selected device, a speaker operatively connected to the output circuit of the radio receiver, a switch in the cir cuit for controlling the speaker, said switch being controlled by the operating means so that it is in one position when the operating means is in normal inoperative position and in another position when the operating means is not in normal inoperative position whereby the.switch will cut out the speaker during the tuning in period so that the speaker will not receive signals from other than the predetermined broadcasting station.

8. In selector mechanism for tuning in radio receiving sets, the combination with a transmitter, of a plurality of tuning in devices for various broadcasting stations, a plurality of selector electro-magnets therefor, electro-magnetic mechanism for operating the selected device, step-bystep electro-magnetic switch mechanism for selecting one of said first-named electro-magnets, circuits and connections for effecting the energization of the selected electro-magnet and the operation of said electro-magnetic mechanism when the transmitter is in a predetermined position, and electric switch interlocking mechanism to prevent the energization of any selector electro-magnet except the one predetermined for selection.

9. In remote control apparatus for radio receiving sets, the combination with a tuning actuator, of a plurality of devices for operating said actuator to tune in any one of a plurality of broadcasting stations, a pivotally mounted sector cooperable with each device, electro-magnetic means for operating said devices, brake mechanism cooperating with the electro-magnetic means for retarding the operation of the electro-magnetic means, and means for selecting the device to be operated by the electro-magnetic means. i v

10. In a radio tuning selector, the combination with a tuning shaft, an operating device therefor corresponding to a broadcasting station, an actuator for said device, an electro-magnetic selector, for said actuator, and electro-magnetic mechanism for operating said selected actuator to in turn operate said selected device to turn said shaft to a predetermined position corresponding to said broadcasting station.

- 11. In a radio tuning selector, the combination with a tuning actuator, of a plurality of 

